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The cross-sectional dimensions refer to the width and height measurements (in millimeters) of the square bar or profile. For example, a 10×10 mm dimension means the piece measures 10 mm on each side of its cross-section.

Tolerances indicate the acceptable deviation from the specified dimension during manufacturing. Larger cross-sections naturally allow slightly greater tolerances (e.g., ±0.25 mm for 20×20 mm) because precision machining becomes more challenging at larger scales, while smaller sizes such as 3×3 mm maintain tighter tolerances of ±0.1 mm.

Larger cross-sectional sizes such as 15×15 mm and 20×20 mm are typically used in applications requiring higher structural strength. The shorter standard length range of 100–500 mm reflects common practical usage requirements and helps maintain material integrity and dimensional accuracy during production.

Yes, custom lengths beyond the listed standard ranges are generally available upon request. It is recommended to contact the supplier directly to discuss specific requirements, as custom orders may involve minimum order quantities or additional lead times.

These cross-sectional dimensions are commonly available in a range of materials including stainless steel, carbon steel, aluminum alloy, and brass, depending on the application requirements. The appropriate material should be selected based on factors such as strength, corrosion resistance, and operating environment.

Selecting the correct size depends on the mechanical load requirements, available installation space, and required precision. Smaller sizes (3×3 to 6×6 mm) are ideal for precision instruments and lightweight assemblies, while larger sizes (10×10 to 20×20 mm) suit heavy-duty structural or industrial applications. Consulting an engineer or the manufacturer is recommended for critical applications.